#!/bin/bash
#
# Copyright 2025 The Dawn & Tint Authors
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
#    contributors may be used to endorse or promote products derived from
#    this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

set -euo pipefail

# Version format: vYYYYMMDD.HHMMSS or vYYYYMMDD.HHMMSS-FORKOWNER.dawn.BRANCHNAME
VERSION_DATETIME=$(git show -s --date=format:'%Y%m%d.%H%M%S' --format=%cd)
VERSION_SUFFIX=${GITHUB_REPOSITORY/\//.}.${GITHUB_REF_NAME}
if [[ "$VERSION_SUFFIX" != "google.dawn.main" ]] ; then
    PKG_VERSION=v${VERSION_DATETIME}-${VERSION_SUFFIX}
else
    PKG_VERSION=v${VERSION_DATETIME}
fi
PKG_FILE=emdawnwebgpu_pkg-${PKG_VERSION}.zip
REMOTE_PORT_FILE=emdawnwebgpu-${PKG_VERSION}.port.py

# Variables for documentation.
SHA=$(git rev-parse HEAD)
EMSDK_VERSION=$(python3 tools/activate-emsdk --get-emsdk-version)

# Initialize dependencies. We could use gclient for this, but then we still have to
# install gclient, and it takes a long time. We only need a few deps for emdawnwebgpu.
git submodule update --init --depth=1 third_party/abseil-cpp
git submodule update --init --depth=1 third_party/googletest
git submodule update --init --depth=1 third_party/emsdk
python3 tools/activate-emsdk

# Build the package (which is not affected by the build type), and build the
# link test in release mode (with Closure, which verifies the JS to some extent)
mkdir -p out/wasm
third_party/emsdk/upstream/emscripten/emcmake cmake -S=. -B=out/wasm -DCMAKE_BUILD_TYPE=Release
make -j4 -C out/wasm emdawnwebgpu_pkg emdawnwebgpu_link_test

# Also build the link test in debug mode.
mkdir -p out/wasm-debug
third_party/emsdk/upstream/emscripten/emcmake cmake -S=. -B=out/wasm-debug -DCMAKE_BUILD_TYPE=Debug
make -j4 -C out/wasm-debug emdawnwebgpu_link_test

# Create zip
cat << EOF > out/wasm/emdawnwebgpu_pkg/VERSION.txt
Dawn release ${PKG_VERSION} at revision <https://dawn.googlesource.com/dawn/+/${SHA}>.
Built/tested with emsdk release ${EMSDK_VERSION}.
EOF
(cd out/wasm && zip -9roX - emdawnwebgpu_pkg > "../../${PKG_FILE}")
PKG_FILE_SHA512=$(python3 -c 'import hashlib, sys; print(hashlib.sha512(sys.stdin.buffer.read()).hexdigest())' < "${PKG_FILE}")

cat << EOF > "$REMOTE_PORT_FILE"
# Copyright 2025 The Emscripten Authors.  All rights reserved.
# Emscripten is available under two separate licenses, the MIT license and the
# University of Illinois/NCSA Open Source License.  Both these licenses can be
# found in the LICENSE file.

r"""
$(cat out/wasm/emdawnwebgpu_pkg/README.md)
"""

TAG = '${PKG_VERSION}'

EXTERNAL_PORT = f'https://github.com/${GITHUB_REPOSITORY}/releases/download/{TAG}/emdawnwebgpu_pkg-{TAG}.zip'
SHA512 = '${PKG_FILE_SHA512}'
PORT_FILE = 'emdawnwebgpu_pkg/emdawnwebgpu.port.py'

# Port information (required)
URL = 'https://dawn.googlesource.com/dawn/+/refs/heads/main/src/emdawnwebgpu/'
DESCRIPTION = "Emdawnwebgpu is a fork of Emscripten's original USE_WEBGPU, implementing a newer, more stable version of the standardized webgpu.h interface."
LICENSE = "Some files: BSD 3-Clause License. Other files: Emscripten's license (available under both MIT License and University of Illinois/NCSA Open Source License)"
EOF

# Create RELEASE_INFO.md
cat << EOF > RELEASE_INFO.md
$(cat out/wasm/emdawnwebgpu_pkg/VERSION.txt)

For instructions, see the README (included in the zip and the port file docstring).
EOF

# Save version numbers for later steps
if [[ -n "${GITHUB_OUTPUT:-}" ]] ; then
    echo "PKG_VERSION=$PKG_VERSION" >> $GITHUB_OUTPUT
    echo "PKG_FILE=$PKG_FILE" >> $GITHUB_OUTPUT
    echo "REMOTE_PORT_FILE=$REMOTE_PORT_FILE" >> $GITHUB_OUTPUT
fi